title: Nature of hydrogen bonding of water molecules in aqueous solutions of glycerol by attenuated total reflection (ATR) infrared spectroscopy.
abstract: Attenuated total reflection infrared (ATR-IR) spectroscopy was performed on glycerol/water solutions in order to gain a better understanding of the strong hydrogen bonding of glycerol as a humectant. The OH stretching band after eliminating the contribution of glycerol OH in the glycerol/water solutions was decomposed using three Gaussian components. With increasing glycerol concentrations up to 50 volume %, the decrease of the 3428 cm(-1) component (middle H-bond component) and the increase of the 3562 cm(-1) component (longer H-bond component) suggested the breaking of H bonds among water molecules. On the other hand, the 3242 cm(-1) component (shorter H-bond component) remained unchanged. It was expected that water molecules surrounding glycerol molecules are retained by strong H bonding between H atoms of water and O atoms in C-O of glycerol when aqueous solutions containing glycerol are introduced in human skin.
authors.affiliation: Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. ykataoka@ess.sci.osaka-u.ac.jp
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kataoka
authors.forename: Norio
authors.initials: N
authors.lastname: Kitadai
authors.forename: Osamu
authors.initials: O
authors.lastname: Hisatomi
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakashima
mesh_terms: D005990:Glycerol / Q000737:chemistry*; D006860:Hydrogen Bonding; D058427:Hygroscopic Agents / Q000737:chemistry*; D016011:Normal Distribution; D011189:Potassium Chloride; D012965:Sodium Chloride; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014867:Water / Q000737:chemistry*
chemical_list: D058427:Hygroscopic Agents; D014867:Water; D012965:Sodium Chloride; D011189:Potassium Chloride; D005990:Glycerol